分式计算:[(a-b)/(a+b)-(a+b)/(a-b)]/b/(a+b)+b/(a-b)1.[(a-b)/(a+b)-(a+b)/(a-b)]/b/(a+b)+b/(a-b)的答案是0么?我做出来分子全能约掉的.2.[1/(1+1/x)+1/(1-1/x)]/{[1-1/(x+1)]/[1+1/(x-1)]}

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分式计算:[(a-b)/(a+b)-(a+b)/(a-b)]/b/(a+b)+b/(a-b)1.[(a-b)/(a+b)-(a+b)/(a-b)]/b/(a+b)+b/(a-b)的答案是0么?我做出来分子全能约掉的.2.[1/(1+1/x)+1/(1-1/x)]/{[1-1/(x+1)]/[1+1/(x-1)]}

分式计算:[(a-b)/(a+b)-(a+b)/(a-b)]/b/(a+b)+b/(a-b)1.[(a-b)/(a+b)-(a+b)/(a-b)]/b/(a+b)+b/(a-b)的答案是0么?我做出来分子全能约掉的.2.[1/(1+1/x)+1/(1-1/x)]/{[1-1/(x+1)]/[1+1/(x-1)]}
分式计算:[(a-b)/(a+b)-(a+b)/(a-b)]/b/(a+b)+b/(a-b)
1.[(a-b)/(a+b)-(a+b)/(a-b)]/b/(a+b)+b/(a-b)的答案是0么?
我做出来分子全能约掉的.
2.[1/(1+1/x)+1/(1-1/x)]/{[1-1/(x+1)]/[1+1/(x-1)]}

分式计算:[(a-b)/(a+b)-(a+b)/(a-b)]/b/(a+b)+b/(a-b)1.[(a-b)/(a+b)-(a+b)/(a-b)]/b/(a+b)+b/(a-b)的答案是0么?我做出来分子全能约掉的.2.[1/(1+1/x)+1/(1-1/x)]/{[1-1/(x+1)]/[1+1/(x-1)]}
[(a-b)/(a+b)-(a+b)/(a-b)]/b/(a+b)+b/(a-b)
={[(a-b)²-(a+b)²]/(a²-b²)}/{[(a-b)²+(a+b)²]/(a²-b²)}
=-4ab/(2a²+2b²)
=-2ab/(a²+b²)